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Vulnerability record · CVE-2019-17420 · published 10 October 2019

CVE-2019-17420: Oisf libhtp vulnerability

Oisf · Libhtp

In OISF LibHTP before 0.5.31, as used in Suricata 4.1.4 and other products, an HTTP protocol parsing error causes the http_header signature to not alert on a response with a single \r\n ending.

5.3 CVSS 3.1 Medium EPSS 1.4% · top 29.2% CWE-459 · CWE-459
5.3CVSS 3.1 base score, v2 5.0
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

In OISF LibHTP before 0.5.31, as used in Suricata 4.1.4 and other products, an HTTP protocol parsing error causes the http_header signature to not alert on a response with a single \r\n ending.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/OISF/libhtp/compare/0.5.30...0.5.31 Patch
https://github.com/OISF/libhtp/pull/213 PatchThird Party Advisory
https://redmine.openinfosecfoundation.org/issues/2969 Issue TrackingVendor Advisory
https://github.com/OISF/libhtp/compare/0.5.30...0.5.31 Patch
https://github.com/OISF/libhtp/pull/213 PatchThird Party Advisory
https://redmine.openinfosecfoundation.org/issues/2969 Issue TrackingVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-17420), CISA KEV, FIRST EPSS (scores of 2026-10-09). This page is refreshed as NVD updates the record.